1.已知x/2=y/3=z/4,求【3x+3y+4x】/5x-2y2.3.4.5. 快点,马上就要·······

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1.已知x/2=y/3=z/4,求【3x+3y+4x】/5x-2y2.3.4.5. 快点,马上就要·······

1.已知x/2=y/3=z/4,求【3x+3y+4x】/5x-2y2.3.4.5. 快点,马上就要·······
1.已知x/2=y/3=z/4,求【3x+3y+4x】/5x-2y

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快点,马上就要·······

1.已知x/2=y/3=z/4,求【3x+3y+4x】/5x-2y2.3.4.5. 快点,马上就要·······
1、【3x+3y+4x】/（5x-2y）=(3*2+3*3+4*4)/(5*2-2*3)=31/4
2、原式(x-3)(x-2)/[3(x+1)(x-1)]*(x+1)/(x-2)*(x+1)/(x-3)=1/3
3、(2x-1)/(x-1)*x(x+1)(x-1)/[(x-2)(x+1)]=(2x²-x)/(x-2)
4、4-(y-3)(y+1)+(y+1)(y-1)=0
解得y=-3,
经检验,原方程的根是y=-3
5、-1/(X-3)(X-4)=-1/(X-6)(X-7)
(X-3)(X-4)=(X-6)(X-7)
解得X=5

经检验，原方程的根是y=-3

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